Toothbrush



FIG. 1 is a perspective view of a toothbrush showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a side elevational view thereof; and,

FIG. 6 is an opposite side elevational view thereof.

The portions depicted in broken line illustrate parts of the toothbrush that form no part of the claimed design. 

CLAIM The ornamental design for a toothbrush, as shown and described. 